i am feeding them starter/grower food from the feed store they act funny i just raised over 30 chicks and no problems with them. they are in a rabbit hutch no bedding just like i did with all the others
is the feed medicated? if not you may be dealing with cocci...
I agree on getting a new bag of feed ... at your petstore they will have a spray for cage birds against mites... use this inside your coop (make sure birds and feed and water are well away while you treat the coop)
my chicks have 75% of there feathers and there are some little black nate flying around there cage it is just strange the way they lay on top of each other they eat and driink real good i am going to change pens today and hope that helps
* The little black gnats thing could be some variety of what we call "no-see-ums" in FL. These things are a real nuisance. They tend to come out at dusk AND THEY BITE! They would *definitely* make the chicks itchy, all that scratching would make their skin red. . . .and they could be huddling together to try to avoid them and to avoid being bitten!! IMAGINE being attacked by hundreds of tiny barely visible mosquitoes!!!